Lighting unit



M y 1931. c; A. B. HALvoRsoN LIGHTING UNIT Filed Nov. 22, 1928 Inventor": Cromwell AB. Halvovsorfi,

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Patented May 19 1931 onoMwELL A. B. nenvonson, or LYNN, nessncnusnrrrs, AssreNon r0 GENERAL mc- 'mrc COMPANY, A" conronnrIon or NEW Y RK LIGHTING U T Application filed November 22, 1928. Serial No. 321,196.

My invention relates to lighting units. More particularly it relates to units ofa type especially adaptedfor use inconnection with streetlighting. I 3: 1

It is very often the case that residents along astreet where such unitsare'located near the buildings object to the direct rays of light from the units In certain instances shields have been interposed between the globe and the light source in the unit in order to intercept or tone down the light. In'such 7 cases marked shadows are formed on the globe which show very markedly from the side and which for that; reason detract from, the appearance of the unit. It is an object ofmy invention to overcome the above objection by providing a. lighting, unit with a form of globe which will overcome the above objection. For example, it is an object of the invention to provide a lighting unit-with. a globe madein angular formand with the shield so located with respect to the light source that the shadow produced by the shield falls altogether on one ofthe sides between the ridges formed where the sides come to gether, with the result thatjthe globe when: viewed from the side shows a shadow of little or no depth or is so obscured that. the

, tures of the invention. Fig. 2 shows the globe of the unit in section and in elevation with the top removed and separated from the base. In this figure the shield is shown in position. Fig. 3 showsthe globe in section taken on line 3-3, Fig. 2. This figure shows the globe clearly to be angular and shows the formation of special ridges where the sides come together. Fig. 4 shows similar View of a globe in which the sides are less curved than in the form of globe shown 1 I in Fig. 3. ,Fig. 5 is a sectional top view of i a plain rectangular globe with the shield interposedbetween the light source and one ofgthe sides. Fig. 6 is a top sectional view of plain triangular globe with the shield interposed between the light source and one of the sides.

Referring more in detail to the drawings, it will'be seenthatthe unit comprises a base 2, a'jglobe 3 and-a canopy 4. Resting 0n the top of the globe 3 is, a frame in the formof a ring 6. This ring is provided with a number of angle pieces7, equally spaced, only two of which are shown, which are suitably secured'to the ring 6. For example, they maybe spot welded to the ring. these angle pieces isprovided with'a top Each 1 of:

sectionwhich extends over the top of the 7 ring and whichrests on the top rim 'ofthe globe; Eachof these pieces isv furthermore provlrledwith ascrew 1O which serves to clamp. the frame to the topflof the globe. x

The frame'is provided with a central arched member 13, see Fig.2, which is hinged on the left of thering6. On the right the mem ber13 may be latched tothe ring 6 in any suitable manner. For example, as indicate ed, 1311638116; of the member 13 is bent at right. angles and a slot is provided in the ring through which the end may enter and latch with 'theringL At the top of the element. 13 there is provided. a threadedpin 14 which receives the threadedpinnacle member 15. Itwill be seen that the'canopy 4 is clamped in position between the globe 3 and the'element'15. H

' Secured tothe base 2 is a lamp socket 16 for receiving theelectricnlampv 17 I11t8I*- posed betweenthe lamp 17 and the globe 3 isa shield 18. This shield, as shown in Figs. 1 ,and 2 yhangs from the ring 6. Preferably, the inner surface of the shield, that is,-t hef surface next to the electric light, is in the form of 'areflecting surface. The globe in Figs. 1, 2, 3, and 4 :is provided with a numberpf ribs 1-9,20,-21, and 22. As indicated inQFig. 3,;the shield 18 will form a shadow, that will fall on the globebetween the lines I 23 and 24; when the light is turned on.

Therefore the edges of the shadow will fall within the region marked by the ribs 19 and 20, with the result that the disagreeable effect caused by the edge of the shadow is avoided due to the fact that the rib breaks the continuity of the surface of the and operates to hide the sharp delnarkation of the shadow.

In Fig. 3 the shield is shown on the narrower Sld of the globe, but in certain instances it may be desirable to place the shield on the broader side of the globe, that is, on the upper side, Fig. 3, in which case a larger shield would be used.

In Fig. 4 the type of globeshown has sides with less curvature than the sides shown in Fig. 3. As indicated in this figure, the cur- 5 and 6 accentuated ridges, such as the ridges 19, 20, 21 and 22 in Fig. 3, are not necessary because the shadow, for example, which falls from the shields 33 and 34 on the sides 35 and 36 respectively, when viewed from one side, presents no depth and consequently the outline of the globe is not affected by the shadow.

By my invention I provide an improved lighting unit in which a shield may be used and in which the globe is designed with ribs or rid between which the shadow cast by the shield falls to prevent the shadow from interfering with or affecting unfavorably the outline of the unit.

It will be understood that while I have elected to illustrate my invention in connection with the specific form of apparatus shown inthe drawings, I do not care to be limited to this particular form of apparatus,

. inasmuch as I contemplate variation and modifications suggested by the disclosure whichdo not depart from the spirit of the invention nor from the scope of the claims contained herein.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. In combination in a lighting unit, a globe for enclosing a source of light, said globe having sides which extend at substantial angles to each other, a shield for the light located between the central axis and a side of the lobe, and means for supportin the shield in p ace in such relation that the e ges of the shadow formed by the shield when the light is turned on fall along the edges of one of said sides.

2. In combination, in a lighting unit, a globe for enclosing a source of light, said globe havin side walls which extend at substantial ang es to each other, a shield for the globe each other, and a light shield interposed between one of the sides of the globe and the longitudinal axis thereof in position to cast all its shadow on said side when the light in the globe is turned on. s

4. In a lighting unit, a globe adapted to enclose a light source, said globe having not 7 less than three curved sides that meet to form ridges along planes passing throu h the longitudinal axis of the globe, and a light shield located in the globe and interposed between one of said sides and the longitudinal axis of "the globe whereby when a light source is placed in said globe along said axis the'shield casts all its shadow on one of said sides.

5. In a lighting .unit, a globe having not less than three curved sides located at an angle each with respect to the other about a longitudinal axis of the globe, the location of the sides with respect to each other being such that a plane transverse the axis of the unit forms a broken curve along the line of intersection of the transverse plane with the surfaces of said sides, and a light shield interposed within the lobe between one of said sides and the longitudinal axis of the globe in such position that whena lighting source is placed in the globe along said axis the shield casts all its shadow on one of said sides.

6. The combination with a globe comprising a plurality of side walls that merge into each other at their edges to form angular corners, of a shield in the globe located in spaced relation to a side of the globe and of a size such that the shadow cast by it falls along the angular corners of the edges of such side. I

In witness whereof, I have hereunto set my hand this 19th day of November, 1928.

CROMVELL A. B. HALVORSON. 

